Our brain has a need
to make the universe orderly. For example, a still
picture can be sliced and diced into an array of small dots or pixels. Stand back and our brain reassembles the
dots as a coherent image of the original picture. An
example is a photo
in a
daily newspaper.
A moving picture scene can be
divided into a sequence of still pictures. If the 'stills' are
repeated fast enough our brain perceives the 'stills' as a
moving
picture. This is the foundation for
creating
movies,
animation, and television.
Our mind’s
eye also recognizes a rainbow of color from a color additive
system. The three primary colors of light --red,
green, &blue
-- can be mixed to produce nearly all color.

Handbook Note: A photo diode converts a
stream of light to a steam of electrons.

The TV
Camera

As motion
picture film, a TV
camera divides a moving
image into a sequence of
still picture frames. Similar to the newspaper photo, each still
frame is
divided into pixel dots.
Each dot, a pixel of light, is converted into a stream of voltage.
This video sequence of images
begins as the prismatic lens assembly of a TV camera
separates light into rainbow paths of color. The
red, green, and blue paths are targeted at a dedicated (one for each color)pixel array of photo diodes mounted on a Charge Couple Device (CCD).

The three CCD arrays are electronically scanned
at 60* frames per second, top to bottom, left to right, line by
line, pixel by pixel. Each produces a modulating stream of voltage that is a modulating analog of the
original red, green, blue light. The voltages are ultimately reconverted into illuminated pixel
framed arrays of the original sequence of still frames on a television screen.

*Handbook Note: The C.I.E. Rec. 2020 UltraHD specification added the frame rate option of 120 fps. This option has not yet been used in consumer electronic products. It is still a commercial project. 120fps is waiting for the full implementation of Rec 2020.